Accommodative intraocular lens

Abstract

An accommodative intraocular lens for implantation in an eye within a natural capsular bag includes a first lens part with an optical body transparent to light and defining an optical axis, front and rear optical body surfaces, haptics connected permanently to the optical body and designed to come into engagement with the capsular bag, a flexible membrane connected permanently to the haptics or the optical body, the membrane having a center axis which runs congruently or parallel to the optical axis and is transparent to light, and a second lens part with a hollow cylinder which can be positioned with a proximal end on the front membrane surface of the first lens part such that the hollow cylinder and the membrane can be displaced along the optical axis towards the front optical body surface and thus the rear membrane surface undergoes a change in the radius of curvature thereof.

What is claimed is: 
     
       1. An accommodative intraocular lens for implantation in an eye within a natural capsular bag in the eye, said natural capsular bag being attached at its periphery to a ciliary muscle of the eye with zonular fibers, the accommodative intraocular lens comprising:
 a first lens part comprising:
 a light-transparent optic body with an optical axis, an anterior optic body surface and a posterior optic body surface, 
 a haptic securely connected to the light-transparent optic body, said haptic being configured to engage with the natural capsular bag to arrange the light-transparent optic body in a middle of the natural capsular bag, and 
 a flexible membrane securely connected to the haptic or the light-transparent optic body, said flexible membrane having an anterior membrane surface and a posterior membrane surface, the flexible membrane being arranged adjacent to the anterior optic body surface, the flexible membrane defining a center axis which extends congruent or parallel to the optical axis, the posterior membrane surface having a radius of curvature, and the flexible membrane being transparent to light; and 
 
 a second lens part having a hollow cylinder which can be detachably coupled to the flexible membrane, wherein a proximal end of the hollow cylinder can be placed on the anterior membrane surface of the first lens part such that a compressive force, which acts on a distal end of the hollow cylinder parallel to the optical axis and which is generable by a movement of the ciliary muscle of the eye, renders the hollow cylinder and the flexible membrane displaceable along the optical axis in a direction to the anterior optic body surface and the posterior membrane surface experiences a change in the radius of curvature thereof, 
 wherein the flexible membrane has a central region and a peripheral region and is coupled to the haptic or the light-transparent optic body in hermetically sealed fashion such that an interior between the posterior membrane surface and the anterior optic body surface is formed, 
 wherein the interior is filled with a gas, and 
 wherein the flexible membrane is configured such that the gas is displaced under the peripheral region in an accommodated state of the intraocular lens. 
 
     
     
       2. The accommodative intraocular lens as claimed in  claim 1 , wherein the flexible membrane has guide elements, with which the hollow cylinder can engage such that the flexible membrane can be placed on the flexible membrane centrally with respect to the optical axis. 
     
     
       3. The accommodative intraocular lens as claimed in  claim 1 , wherein the flexible membrane has a central region and a peripheral region, and
 wherein the central region has a larger thickness than the peripheral region. 
 
     
     
       4. The accommodative intraocular lens as claimed in  claim 1 , wherein the flexible membrane is displaceable such that the posterior membrane surface can be brought into contact with at least one apex of the anterior optic body surface. 
     
     
       5. The accommodative intraocular lens as claimed in  claim 1 , wherein the hollow cylinder has a circumferential collar at the distal end, and
 wherein the circumferential collar can be brought into engagement with an interior wall of the natural capsular bag. 
 
     
     
       6. The accommodative intraocular lens as claimed in  claim 1 , wherein an elevation with a height of more than  0 . 05  mm is formed on the anterior optic body surface.